[PATCH 0/7] arm64: exynos: Enable SPI for Exynos850

[PATCH 0/7] arm64: exynos: Enable SPI for Exynos850

[Sam Protsenko]

This series enables SPI for Exynos850 SoC. The summary:

  1. Enable PDMA, it's needed for SPI (dts, clk)
  2. Propagate SPI src clock rate change up to DIV clocks, to make it
     possible to change SPI frequency (clk driver)
  3. Add Exynos850 support in SPI driver
  4. Add SPI nodes to Exynos850 SoC dtsi

All SPI instances were tested using `spidev_test' tool in all 3 possible
modes:

  - Polling mode: xfer_size <= 32
  - IRQ mode: 64 >= xfer_size >= 32
  - DMA mode: xfer_size > 64

with 200 kHz ... 49.9 MHz SPI frequencies. The next 3 approaches were
used:

  1. Software loopback ('-l' option for `spidev_test' tool)
  2. Hardware loopback (by connecting MISO line to MOSI)
  3. By communicating with ATMega found on Sensors Mezzanine board [1],
     programmed to act as an SPI slave device

and all the transactions were additionally checked on my Logic Analyzer
to make sure the SCK frequencies were actually correct.

[1] https://www.96boards.org/product/sensors-mezzanine/

Sam Protsenko (7):
  dt-bindings: clock: exynos850: Add PDMA clocks
  dt-bindings: spi: samsung: Add Exynos850 SPI
  clk: samsung: exynos850: Add PDMA clocks
  clk: samsung: exynos850: Propagate SPI IPCLK rate change
  spi: s3c64xx: Add Exynos850 support
  arm64: dts: exynos: Add PDMA node for Exynos850
  arm64: dts: exynos: Add SPI nodes for Exynos850

 .../devicetree/bindings/spi/samsung,spi.yaml  |  1 +
 arch/arm64/boot/dts/exynos/exynos850.dtsi     | 64 +++++++++++++++++++
 drivers/clk/samsung/clk-exynos850.c           | 42 +++++++-----
 drivers/spi/spi-s3c64xx.c                     | 14 ++++
 include/dt-bindings/clock/exynos850.h         |  2 +
 5 files changed, 106 insertions(+), 17 deletions(-)

-- 
2.39.2

[PATCH 1/7] dt-bindings: clock: exynos850: Add PDMA clocks

[Sam Protsenko]

Add constants for Peripheral DMA (PDMA) clocks in CMU_CORE controller:
  - PDMA_ACLK: clock for PDMA0 (regular DMA)
  - SPDMA_ACLK: clock for PDMA1 (secure DMA)

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---
 include/dt-bindings/clock/exynos850.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/dt-bindings/clock/exynos850.h b/include/dt-bindings/clock/exynos850.h
index 3090e09c9a55..bc15108aa3c2 100644
--- a/include/dt-bindings/clock/exynos850.h
+++ b/include/dt-bindings/clock/exynos850.h
@@ -320,6 +320,8 @@
 #define CLK_GOUT_SSS_PCLK		12
 #define CLK_GOUT_GPIO_CORE_PCLK		13
 #define CLK_GOUT_SYSREG_CORE_PCLK	14
+#define CLK_GOUT_PDMA_CORE_ACLK		15
+#define CLK_GOUT_SPDMA_CORE_ACLK	16
 
 /* CMU_DPU */
 #define CLK_MOUT_DPU_USER		1
-- 
2.39.2

[PATCH 2/7] dt-bindings: spi: samsung: Add Exynos850 SPI

[Sam Protsenko]

Document samsung,exynos850-spi compatible which will be used on
Exynos850 SoC. Exynos850 doesn't have ioclk, so only two clocks are
needed (bus clock and functional SPI clock).

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---
 Documentation/devicetree/bindings/spi/samsung,spi.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/spi/samsung,spi.yaml b/Documentation/devicetree/bindings/spi/samsung,spi.yaml
index 79da99ca0e53..f71099852653 100644
--- a/Documentation/devicetree/bindings/spi/samsung,spi.yaml
+++ b/Documentation/devicetree/bindings/spi/samsung,spi.yaml
@@ -22,6 +22,7 @@ properties:
           - samsung,s5pv210-spi # for S5PV210 and S5PC110
           - samsung,exynos4210-spi
           - samsung,exynos5433-spi
+          - samsung,exynos850-spi
           - samsung,exynosautov9-spi
           - tesla,fsd-spi
       - const: samsung,exynos7-spi
-- 
2.39.2

[PATCH 3/7] clk: samsung: exynos850: Add PDMA clocks

[Sam Protsenko]

Add Peripheral DMA (PDMA) clocks in CMU_CORE controller:
  - PDMA_ACLK: clock for PDMA0 (regular DMA)
  - SPDMA_ACLK: clock for PDMA1 (secure DMA)

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---
 drivers/clk/samsung/clk-exynos850.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/samsung/clk-exynos850.c b/drivers/clk/samsung/clk-exynos850.c
index bdc1eef7d6e5..01913dc4eb27 100644
--- a/drivers/clk/samsung/clk-exynos850.c
+++ b/drivers/clk/samsung/clk-exynos850.c
@@ -26,7 +26,7 @@
 #define CLKS_NR_IS			(CLK_GOUT_IS_SYSREG_PCLK + 1)
 #define CLKS_NR_MFCMSCL			(CLK_GOUT_MFCMSCL_SYSREG_PCLK + 1)
 #define CLKS_NR_PERI			(CLK_GOUT_WDT1_PCLK + 1)
-#define CLKS_NR_CORE			(CLK_GOUT_SYSREG_CORE_PCLK + 1)
+#define CLKS_NR_CORE			(CLK_GOUT_SPDMA_CORE_ACLK + 1)
 #define CLKS_NR_DPU			(CLK_GOUT_DPU_SYSREG_PCLK + 1)
 
 /* ---- CMU_TOP ------------------------------------------------------------- */
@@ -1667,6 +1667,8 @@ CLK_OF_DECLARE(exynos850_cmu_peri, "samsung,exynos850-cmu-peri",
 #define CLK_CON_GAT_GOUT_CORE_GPIO_CORE_PCLK	0x2044
 #define CLK_CON_GAT_GOUT_CORE_MMC_EMBD_I_ACLK	0x20e8
 #define CLK_CON_GAT_GOUT_CORE_MMC_EMBD_SDCLKIN	0x20ec
+#define CLK_CON_GAT_GOUT_CORE_PDMA_ACLK		0x20f0
+#define CLK_CON_GAT_GOUT_CORE_SPDMA_ACLK	0x2124
 #define CLK_CON_GAT_GOUT_CORE_SSS_I_ACLK	0x2128
 #define CLK_CON_GAT_GOUT_CORE_SSS_I_PCLK	0x212c
 #define CLK_CON_GAT_GOUT_CORE_SYSREG_CORE_PCLK	0x2130
@@ -1683,6 +1685,8 @@ static const unsigned long core_clk_regs[] __initconst = {
 	CLK_CON_GAT_GOUT_CORE_GPIO_CORE_PCLK,
 	CLK_CON_GAT_GOUT_CORE_MMC_EMBD_I_ACLK,
 	CLK_CON_GAT_GOUT_CORE_MMC_EMBD_SDCLKIN,
+	CLK_CON_GAT_GOUT_CORE_PDMA_ACLK,
+	CLK_CON_GAT_GOUT_CORE_SPDMA_ACLK,
 	CLK_CON_GAT_GOUT_CORE_SSS_I_ACLK,
 	CLK_CON_GAT_GOUT_CORE_SSS_I_PCLK,
 	CLK_CON_GAT_GOUT_CORE_SYSREG_CORE_PCLK,
@@ -1726,6 +1730,10 @@ static const struct samsung_gate_clock core_gate_clks[] __initconst = {
 	GATE(CLK_GOUT_MMC_EMBD_SDCLKIN, "gout_mmc_embd_sdclkin",
 	     "mout_core_mmc_embd_user", CLK_CON_GAT_GOUT_CORE_MMC_EMBD_SDCLKIN,
 	     21, CLK_SET_RATE_PARENT, 0),
+	GATE(CLK_GOUT_PDMA_CORE_ACLK, "gout_pdma_core_aclk",
+	     "mout_core_bus_user", CLK_CON_GAT_GOUT_CORE_PDMA_ACLK, 21, 0, 0),
+	GATE(CLK_GOUT_SPDMA_CORE_ACLK, "gout_spdma_core_aclk",
+	     "mout_core_bus_user", CLK_CON_GAT_GOUT_CORE_SPDMA_ACLK, 21, 0, 0),
 	GATE(CLK_GOUT_SSS_ACLK, "gout_sss_aclk", "mout_core_sss_user",
 	     CLK_CON_GAT_GOUT_CORE_SSS_I_ACLK, 21, 0, 0),
 	GATE(CLK_GOUT_SSS_PCLK, "gout_sss_pclk", "dout_core_busp",
-- 
2.39.2

[PATCH 4/7] clk: samsung: exynos850: Propagate SPI IPCLK rate change

[Sam Protsenko]

When SPI transfer is being prepared, the spi-s3c64xx driver will call
clk_set_rate() to change the rate of SPI source clock (IPCLK). But IPCLK
is a gate (leaf) clock, so it must propagate the rate change up the
clock tree, so that corresponding DIV clocks can actually change their
divider values. Add CLK_SET_RATE_PARENT flag to corresponding clocks for
all SPI instances in Exynos850 (spi_0, spi_1 and spi_2) to make it
possible. This change involves next clocks:

usi_spi_0:

    Clock                  Block       Div range
    --------------------------------------------
    gout_spi0_ipclk        CMU_PERI    -
    dout_peri_spi0         CMU_PERI    /1..32
    mout_peri_spi_user     CMU_PERI    -
    dout_peri_ip           CMU_TOP     /1..16

usi_cmgp0:

    Clock                  Block       Div range
    --------------------------------------------
    gout_cmgp_usi0_ipclk   CMU_CMGP    -
    dout_cmgp_usi0         CMU_CMGP    /1..32
    mout_cmgp_usi0         CMU_CMGP    -
    gout_clkcmu_cmgp_bus   CMU_APM     -
    dout_apm_bus           CMU_APM     /1..8

usi_cmgp1:

    Clock                  Block       Div range
    --------------------------------------------
    gout_cmgp_usi1_ipclk   CMU_CMGP    -
    dout_cmgp_usi1         CMU_CMGP    /1..32
    mout_cmgp_usi1         CMU_CMGP    -
    gout_clkcmu_cmgp_bus   CMU_APM     -
    dout_apm_bus           CMU_APM     /1..8

With input clock of 400 MHz, this scheme provides next IPCLK rate range,
for each SPI block:

    SPI0:   781 kHz ... 400 MHz
    SPI1/2: 1.6 MHz ... 400 MHz

Accounting for internal /4 divider in SPI blocks, and because the max
SPI frequency is limited at 50 MHz, it gives us next SPI SCK rates:

    SPI0:   200 kHz ... 49.9 MHz
    SPI1/2: 400 kHz ... 49.9 MHz

Which should cover all possible applications of SPI bus. Of course,
setting SPI frequency to values as low as 500 kHz will also affect the
common bus dividers (dout_apm_bus or dout_peri_ip), which in turn
effectively lowers the rates for all leaf bus clocks derived from those
dividers, like HSI2C and I3C clocks. But at least it gives the board
designer a choice, whether to keep all clocks (SPI/HSI2C/I3C) at high
frequencies, or make all those clocks have lower frequencies. Not
propagating the rate change to those common dividers would limit this
choice to "only high frequencies are allowed for SPI/HSI2C/I3C" option,
making the common dividers useless. This decision follows the "Worse is
better" approach, relying on the users/engineers to know the system
internals when working with such low-level features, instead of trying
to account for all possible use-cases.

Fixes: 7dd05578198b ("clk: samsung: Introduce Exynos850 clock driver")
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---
 drivers/clk/samsung/clk-exynos850.c | 32 ++++++++++++++---------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/drivers/clk/samsung/clk-exynos850.c b/drivers/clk/samsung/clk-exynos850.c
index 01913dc4eb27..32a8cb861702 100644
--- a/drivers/clk/samsung/clk-exynos850.c
+++ b/drivers/clk/samsung/clk-exynos850.c
@@ -605,7 +605,7 @@ static const struct samsung_div_clock apm_div_clks[] __initconst = {
 
 static const struct samsung_gate_clock apm_gate_clks[] __initconst = {
 	GATE(CLK_GOUT_CLKCMU_CMGP_BUS, "gout_clkcmu_cmgp_bus", "dout_apm_bus",
-	     CLK_CON_GAT_CLKCMU_CMGP_BUS, 21, 0, 0),
+	     CLK_CON_GAT_CLKCMU_CMGP_BUS, 21, CLK_SET_RATE_PARENT, 0),
 	GATE(CLK_GOUT_CLKCMU_CHUB_BUS, "gout_clkcmu_chub_bus",
 	     "mout_clkcmu_chub_bus",
 	     CLK_CON_GAT_GATE_CLKCMU_CHUB_BUS, 21, 0, 0),
@@ -974,19 +974,19 @@ static const struct samsung_fixed_rate_clock cmgp_fixed_clks[] __initconst = {
 static const struct samsung_mux_clock cmgp_mux_clks[] __initconst = {
 	MUX(CLK_MOUT_CMGP_ADC, "mout_cmgp_adc", mout_cmgp_adc_p,
 	    CLK_CON_MUX_CLK_CMGP_ADC, 0, 1),
-	MUX(CLK_MOUT_CMGP_USI0, "mout_cmgp_usi0", mout_cmgp_usi0_p,
-	    CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP0, 0, 1),
-	MUX(CLK_MOUT_CMGP_USI1, "mout_cmgp_usi1", mout_cmgp_usi1_p,
-	    CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP1, 0, 1),
+	MUX_F(CLK_MOUT_CMGP_USI0, "mout_cmgp_usi0", mout_cmgp_usi0_p,
+	    CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP0, 0, 1, CLK_SET_RATE_PARENT, 0),
+	MUX_F(CLK_MOUT_CMGP_USI1, "mout_cmgp_usi1", mout_cmgp_usi1_p,
+	    CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP1, 0, 1, CLK_SET_RATE_PARENT, 0),
 };
 
 static const struct samsung_div_clock cmgp_div_clks[] __initconst = {
 	DIV(CLK_DOUT_CMGP_ADC, "dout_cmgp_adc", "gout_clkcmu_cmgp_bus",
 	    CLK_CON_DIV_DIV_CLK_CMGP_ADC, 0, 4),
-	DIV(CLK_DOUT_CMGP_USI0, "dout_cmgp_usi0", "mout_cmgp_usi0",
-	    CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP0, 0, 5),
-	DIV(CLK_DOUT_CMGP_USI1, "dout_cmgp_usi1", "mout_cmgp_usi1",
-	    CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP1, 0, 5),
+	DIV_F(CLK_DOUT_CMGP_USI0, "dout_cmgp_usi0", "mout_cmgp_usi0",
+	    CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP0, 0, 5, CLK_SET_RATE_PARENT, 0),
+	DIV_F(CLK_DOUT_CMGP_USI1, "dout_cmgp_usi1", "mout_cmgp_usi1",
+	    CLK_CON_DIV_DIV_CLK_CMGP_USI_CMGP1, 0, 5, CLK_SET_RATE_PARENT, 0),
 };
 
 static const struct samsung_gate_clock cmgp_gate_clks[] __initconst = {
@@ -1001,12 +1001,12 @@ static const struct samsung_gate_clock cmgp_gate_clks[] __initconst = {
 	     "gout_clkcmu_cmgp_bus",
 	     CLK_CON_GAT_GOUT_CMGP_GPIO_PCLK, 21, CLK_IGNORE_UNUSED, 0),
 	GATE(CLK_GOUT_CMGP_USI0_IPCLK, "gout_cmgp_usi0_ipclk", "dout_cmgp_usi0",
-	     CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_IPCLK, 21, 0, 0),
+	     CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_IPCLK, 21, CLK_SET_RATE_PARENT, 0),
 	GATE(CLK_GOUT_CMGP_USI0_PCLK, "gout_cmgp_usi0_pclk",
 	     "gout_clkcmu_cmgp_bus",
 	     CLK_CON_GAT_GOUT_CMGP_USI_CMGP0_PCLK, 21, 0, 0),
 	GATE(CLK_GOUT_CMGP_USI1_IPCLK, "gout_cmgp_usi1_ipclk", "dout_cmgp_usi1",
-	     CLK_CON_GAT_GOUT_CMGP_USI_CMGP1_IPCLK, 21, 0, 0),
+	     CLK_CON_GAT_GOUT_CMGP_USI_CMGP1_IPCLK, 21, CLK_SET_RATE_PARENT, 0),
 	GATE(CLK_GOUT_CMGP_USI1_PCLK, "gout_cmgp_usi1_pclk",
 	     "gout_clkcmu_cmgp_bus",
 	     CLK_CON_GAT_GOUT_CMGP_USI_CMGP1_PCLK, 21, 0, 0),
@@ -1557,8 +1557,8 @@ static const struct samsung_mux_clock peri_mux_clks[] __initconst = {
 	    mout_peri_uart_user_p, PLL_CON0_MUX_CLKCMU_PERI_UART_USER, 4, 1),
 	MUX(CLK_MOUT_PERI_HSI2C_USER, "mout_peri_hsi2c_user",
 	    mout_peri_hsi2c_user_p, PLL_CON0_MUX_CLKCMU_PERI_HSI2C_USER, 4, 1),
-	MUX(CLK_MOUT_PERI_SPI_USER, "mout_peri_spi_user", mout_peri_spi_user_p,
-	    PLL_CON0_MUX_CLKCMU_PERI_SPI_USER, 4, 1),
+	MUX_F(CLK_MOUT_PERI_SPI_USER, "mout_peri_spi_user", mout_peri_spi_user_p,
+	    PLL_CON0_MUX_CLKCMU_PERI_SPI_USER, 4, 1, CLK_SET_RATE_PARENT, 0),
 };
 
 static const struct samsung_div_clock peri_div_clks[] __initconst = {
@@ -1568,8 +1568,8 @@ static const struct samsung_div_clock peri_div_clks[] __initconst = {
 	    CLK_CON_DIV_DIV_CLK_PERI_HSI2C_1, 0, 5),
 	DIV(CLK_DOUT_PERI_HSI2C2, "dout_peri_hsi2c2", "gout_peri_hsi2c2",
 	    CLK_CON_DIV_DIV_CLK_PERI_HSI2C_2, 0, 5),
-	DIV(CLK_DOUT_PERI_SPI0, "dout_peri_spi0", "mout_peri_spi_user",
-	    CLK_CON_DIV_DIV_CLK_PERI_SPI_0, 0, 5),
+	DIV_F(CLK_DOUT_PERI_SPI0, "dout_peri_spi0", "mout_peri_spi_user",
+	    CLK_CON_DIV_DIV_CLK_PERI_SPI_0, 0, 5, CLK_SET_RATE_PARENT, 0),
 };
 
 static const struct samsung_gate_clock peri_gate_clks[] __initconst = {
@@ -1611,7 +1611,7 @@ static const struct samsung_gate_clock peri_gate_clks[] __initconst = {
 	     "mout_peri_bus_user",
 	     CLK_CON_GAT_GOUT_PERI_PWM_MOTOR_PCLK, 21, 0, 0),
 	GATE(CLK_GOUT_SPI0_IPCLK, "gout_spi0_ipclk", "dout_peri_spi0",
-	     CLK_CON_GAT_GOUT_PERI_SPI_0_IPCLK, 21, 0, 0),
+	     CLK_CON_GAT_GOUT_PERI_SPI_0_IPCLK, 21, CLK_SET_RATE_PARENT, 0),
 	GATE(CLK_GOUT_SPI0_PCLK, "gout_spi0_pclk", "mout_peri_bus_user",
 	     CLK_CON_GAT_GOUT_PERI_SPI_0_PCLK, 21, 0, 0),
 	GATE(CLK_GOUT_SYSREG_PERI_PCLK, "gout_sysreg_peri_pclk",
-- 
2.39.2

[PATCH 5/7] spi: s3c64xx: Add Exynos850 support

[Sam Protsenko]

Add SPI port configuration for Exynos850 SoC. It has 3 USI blocks which
can be configured in SPI mode:

  * spi_0: BLK_PERI_SPI_0 (0x13940000)
  * spi_1: BLK_ALIVE_USI_CMGP00 (0x11d00000)
  * spi_2: BLK_ALIVE_USI_CMGP01 (0x11d20000)

SPI FIFO depth is 64 bytes for all those SPI blocks, so the
.fifo_lvl_mask value is set to 0x7f. All blocks have DIV_4 as the
default internal clock divider, and an internal loopback mode to run
a loopback test.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---
 drivers/spi/spi-s3c64xx.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 0e48ffd499b9..f7d623ad6ac3 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1461,6 +1461,17 @@ static const struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
 	.quirks		= S3C64XX_SPI_QUIRK_CS_AUTO,
 };
 
+static const struct s3c64xx_spi_port_config exynos850_spi_port_config = {
+	.fifo_lvl_mask	= { 0x7f, 0x7f, 0x7f },
+	.rx_lvl_offset	= 15,
+	.tx_st_done	= 25,
+	.clk_div	= 4,
+	.high_speed	= true,
+	.clk_from_cmu	= true,
+	.has_loopback	= true,
+	.quirks		= S3C64XX_SPI_QUIRK_CS_AUTO,
+};
+
 static const struct s3c64xx_spi_port_config exynosautov9_spi_port_config = {
 	.fifo_lvl_mask	= { 0x1ff, 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff, 0x7f,
 			    0x7f, 0x7f, 0x7f, 0x7f},
@@ -1515,6 +1526,9 @@ static const struct of_device_id s3c64xx_spi_dt_match[] = {
 	{ .compatible = "samsung,exynos5433-spi",
 			.data = (void *)&exynos5433_spi_port_config,
 	},
+	{ .compatible = "samsung,exynos850-spi",
+			.data = (void *)&exynos850_spi_port_config,
+	},
 	{ .compatible = "samsung,exynosautov9-spi",
 			.data = (void *)&exynosautov9_spi_port_config,
 	},
-- 
2.39.2

[PATCH 6/7] arm64: dts: exynos: Add PDMA node for Exynos850

[Sam Protsenko]

Enable PDMA node. It's needed for multiple peripheral modules, like SPI.
Use "arm,pl330-broken-no-flushp" quirk, as otherwise SPI transfers in
DMA mode often fail with error like this:

    I/O Error: rx-1 tx-1 rx-f tx-f len-786 dma-1 res-(-5)

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---
 arch/arm64/boot/dts/exynos/exynos850.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/exynos850.dtsi b/arch/arm64/boot/dts/exynos/exynos850.dtsi
index da3f4a791e68..cd0a452cd6b4 100644
--- a/arch/arm64/boot/dts/exynos/exynos850.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos850.dtsi
@@ -197,6 +197,16 @@ gic: interrupt-controller@12a01000 {
 						 IRQ_TYPE_LEVEL_HIGH)>;
 		};
 
+		pdma0: dma-controller@120c0000 {
+			compatible = "arm,pl330", "arm,primecell";
+			reg = <0x120c0000 0x1000>;
+			interrupts = <GIC_SPI 479 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&cmu_core CLK_GOUT_PDMA_CORE_ACLK>;
+			clock-names = "apb_pclk";
+			arm,pl330-broken-no-flushp;
+			#dma-cells = <1>;
+		};
+
 		pmu_system_controller: system-controller@11860000 {
 			compatible = "samsung,exynos850-pmu", "syscon";
 			reg = <0x11860000 0x10000>;
-- 
2.39.2

[PATCH 7/7] arm64: dts: exynos: Add SPI nodes for Exynos850

[Sam Protsenko]

Some USI blocks can be configured as SPI controllers. Add corresponding
SPI nodes to Exynos850 SoC device tree.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---
 arch/arm64/boot/dts/exynos/exynos850.dtsi | 54 +++++++++++++++++++++++
 1 file changed, 54 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/exynos850.dtsi b/arch/arm64/boot/dts/exynos/exynos850.dtsi
index cd0a452cd6b4..e35973a254e6 100644
--- a/arch/arm64/boot/dts/exynos/exynos850.dtsi
+++ b/arch/arm64/boot/dts/exynos/exynos850.dtsi
@@ -738,6 +738,24 @@ usi_spi_0: usi@139400c0 {
 				 <&cmu_peri CLK_GOUT_SPI0_IPCLK>;
 			clock-names = "pclk", "ipclk";
 			status = "disabled";
+
+			spi_0: spi@13940000 {
+				compatible = "samsung,exynos850-spi";
+				reg = <0x13940000 0x30>;
+				interrupts = <GIC_SPI 221 IRQ_TYPE_LEVEL_HIGH>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&spi0_pins>;
+				clocks = <&cmu_peri CLK_GOUT_SPI0_IPCLK>,
+					 <&cmu_peri CLK_GOUT_SPI0_PCLK>;
+				clock-names = "spi_busclk0", "spi";
+				samsung,spi-src-clk = <0>;
+				dmas = <&pdma0 5>, <&pdma0 4>;
+				dma-names = "tx", "rx";
+				num-cs = <1>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				status = "disabled";
+			};
 		};
 
 		usi_cmgp0: usi@11d000c0 {
@@ -779,6 +797,24 @@ serial_1: serial@11d00000 {
 				clock-names = "uart", "clk_uart_baud0";
 				status = "disabled";
 			};
+
+			spi_1: spi@11d00000 {
+				compatible = "samsung,exynos850-spi";
+				reg = <0x11d00000 0x30>;
+				interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&spi1_pins>;
+				clocks = <&cmu_cmgp CLK_GOUT_CMGP_USI0_IPCLK>,
+					 <&cmu_cmgp CLK_GOUT_CMGP_USI0_PCLK>;
+				clock-names = "spi_busclk0", "spi";
+				samsung,spi-src-clk = <0>;
+				dmas = <&pdma0 12>, <&pdma0 13>;
+				dma-names = "tx", "rx";
+				num-cs = <1>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				status = "disabled";
+			};
 		};
 
 		usi_cmgp1: usi@11d200c0 {
@@ -820,6 +856,24 @@ serial_2: serial@11d20000 {
 				clock-names = "uart", "clk_uart_baud0";
 				status = "disabled";
 			};
+
+			spi_2: spi@11d20000 {
+				compatible = "samsung,exynos850-spi";
+				reg = <0x11d20000 0x30>;
+				interrupts = <GIC_SPI 63 IRQ_TYPE_LEVEL_HIGH>;
+				pinctrl-names = "default";
+				pinctrl-0 = <&spi2_pins>;
+				clocks = <&cmu_cmgp CLK_GOUT_CMGP_USI1_IPCLK>,
+					 <&cmu_cmgp CLK_GOUT_CMGP_USI1_PCLK>;
+				clock-names = "spi_busclk0", "spi";
+				samsung,spi-src-clk = <0>;
+				dmas = <&pdma0 14>, <&pdma0 15>;
+				dma-names = "tx", "rx";
+				num-cs = <1>;
+				#address-cells = <1>;
+				#size-cells = <0>;
+				status = "disabled";
+			};
 		};
 	};
 };
-- 
2.39.2

Re: [PATCH 2/7] dt-bindings: spi: samsung: Add Exynos850 SPI

[Krzysztof Kozlowski]

On 20/01/2024 02:29, Sam Protsenko wrote:
> Document samsung,exynos850-spi compatible which will be used on
> Exynos850 SoC. Exynos850 doesn't have ioclk, so only two clocks are
> needed (bus clock and functional SPI clock).
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
> ---
>  Documentation/devicetree/bindings/spi/samsung,spi.yaml | 1 +


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

I assume this will go via SPI tree. Probably better to send SPI patches
separately with fixed subject prefix (spi: dt-bindings: samsung:)

Best regards,
Krzysztof

Re: [PATCH 4/7] clk: samsung: exynos850: Propagate SPI IPCLK rate change

[Krzysztof Kozlowski]

On 20/01/2024 02:29, Sam Protsenko wrote:
> @@ -974,19 +974,19 @@ static const struct samsung_fixed_rate_clock cmgp_fixed_clks[] __initconst = {
>  static const struct samsung_mux_clock cmgp_mux_clks[] __initconst = {
>  	MUX(CLK_MOUT_CMGP_ADC, "mout_cmgp_adc", mout_cmgp_adc_p,
>  	    CLK_CON_MUX_CLK_CMGP_ADC, 0, 1),
> -	MUX(CLK_MOUT_CMGP_USI0, "mout_cmgp_usi0", mout_cmgp_usi0_p,
> -	    CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP0, 0, 1),
> -	MUX(CLK_MOUT_CMGP_USI1, "mout_cmgp_usi1", mout_cmgp_usi1_p,
> -	    CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP1, 0, 1),
> +	MUX_F(CLK_MOUT_CMGP_USI0, "mout_cmgp_usi0", mout_cmgp_usi0_p,
> +	    CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP0, 0, 1, CLK_SET_RATE_PARENT, 0),
> +	MUX_F(CLK_MOUT_CMGP_USI1, "mout_cmgp_usi1", mout_cmgp_usi1_p,
> +	    CLK_CON_MUX_MUX_CLK_CMGP_USI_CMGP1, 0, 1, CLK_SET_RATE_PARENT, 0),

Checkpatch strict complains on missing alignment. Please fix.

Best regards,
Krzysztof

Re: (subset) [PATCH 1/7] dt-bindings: clock: exynos850: Add PDMA clocks

[Krzysztof Kozlowski]

On Fri, 19 Jan 2024 19:29:42 -0600, Sam Protsenko wrote:
> Add constants for Peripheral DMA (PDMA) clocks in CMU_CORE controller:
>   - PDMA_ACLK: clock for PDMA0 (regular DMA)
>   - SPDMA_ACLK: clock for PDMA1 (secure DMA)
> 
> 

Applied, thanks!

[1/7] dt-bindings: clock: exynos850: Add PDMA clocks
      https://git.kernel.org/krzk/linux/c/bc8cc7fb55b8da8c6b947603b1bad585e866b90c

Best regards,
-- 
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Re: (subset) [PATCH 3/7] clk: samsung: exynos850: Add PDMA clocks

[Krzysztof Kozlowski]

On Fri, 19 Jan 2024 19:29:44 -0600, Sam Protsenko wrote:
> Add Peripheral DMA (PDMA) clocks in CMU_CORE controller:
>   - PDMA_ACLK: clock for PDMA0 (regular DMA)
>   - SPDMA_ACLK: clock for PDMA1 (secure DMA)
> 
> 

Applied, thanks!

[3/7] clk: samsung: exynos850: Add PDMA clocks
      https://git.kernel.org/krzk/linux/c/00e532cd023ccee170239360978c65eced06125a

Best regards,
-- 
Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Re: [PATCH 6/7] arm64: dts: exynos: Add PDMA node for Exynos850

[Krzysztof Kozlowski]

On 20/01/2024 02:29, Sam Protsenko wrote:
> Enable PDMA node. It's needed for multiple peripheral modules, like SPI.
> Use "arm,pl330-broken-no-flushp" quirk, as otherwise SPI transfers in
> DMA mode often fail with error like this:
> 
>     I/O Error: rx-1 tx-1 rx-f tx-f len-786 dma-1 res-(-5)
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
> ---
>  arch/arm64/boot/dts/exynos/exynos850.dtsi | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/exynos/exynos850.dtsi b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> index da3f4a791e68..cd0a452cd6b4 100644
> --- a/arch/arm64/boot/dts/exynos/exynos850.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> @@ -197,6 +197,16 @@ gic: interrupt-controller@12a01000 {
>  						 IRQ_TYPE_LEVEL_HIGH)>;
>  		};
>  
> +		pdma0: dma-controller@120c0000 {

Looks misordered. Keep unit-address order.

> +			compatible = "arm,pl330", "arm,primecell";
> +			reg = <0x120c0000 0x1000>;
> +			interrupts = <GIC_SPI 479 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&cmu_core CLK_GOUT_PDMA_CORE_ACLK>;
> +			clock-names = "apb_pclk";

Best regards,
Krzysztof

Re: [PATCH 7/7] arm64: dts: exynos: Add SPI nodes for Exynos850

[Krzysztof Kozlowski]

On 20/01/2024 02:29, Sam Protsenko wrote:
> Some USI blocks can be configured as SPI controllers. Add corresponding
> SPI nodes to Exynos850 SoC device tree.
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
> ---
>  arch/arm64/boot/dts/exynos/exynos850.dtsi | 54 +++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/exynos/exynos850.dtsi b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> index cd0a452cd6b4..e35973a254e6 100644
> --- a/arch/arm64/boot/dts/exynos/exynos850.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynos850.dtsi
> @@ -738,6 +738,24 @@ usi_spi_0: usi@139400c0 {
>  				 <&cmu_peri CLK_GOUT_SPI0_IPCLK>;
>  			clock-names = "pclk", "ipclk";
>  			status = "disabled";
> +
> +			spi_0: spi@13940000 {
> +				compatible = "samsung,exynos850-spi";
> +				reg = <0x13940000 0x30>;
> +				interrupts = <GIC_SPI 221 IRQ_TYPE_LEVEL_HIGH>;
> +				pinctrl-names = "default";
> +				pinctrl-0 = <&spi0_pins>;

pinctrl-0
pinctrl-names

Same in other places.



Best regards,
Krzysztof

Re: [PATCH 2/7] dt-bindings: spi: samsung: Add Exynos850 SPI

[Tudor Ambarus]

On 1/20/24 01:29, Sam Protsenko wrote:
> Document samsung,exynos850-spi compatible which will be used on
> Exynos850 SoC. Exynos850 doesn't have ioclk, so only two clocks are
> needed (bus clock and functional SPI clock).
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>

Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>

As Krzysztof mentioned, I see lots of spi dt-bindings patches prefixed
with ``spi: dt-bindings:``, so probably it is better to follow that.

> ---
>  Documentation/devicetree/bindings/spi/samsung,spi.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/spi/samsung,spi.yaml b/Documentation/devicetree/bindings/spi/samsung,spi.yaml
> index 79da99ca0e53..f71099852653 100644
> --- a/Documentation/devicetree/bindings/spi/samsung,spi.yaml
> +++ b/Documentation/devicetree/bindings/spi/samsung,spi.yaml
> @@ -22,6 +22,7 @@ properties:
>            - samsung,s5pv210-spi # for S5PV210 and S5PC110
>            - samsung,exynos4210-spi
>            - samsung,exynos5433-spi
> +          - samsung,exynos850-spi
>            - samsung,exynosautov9-spi
>            - tesla,fsd-spi
>        - const: samsung,exynos7-spi

Re: [PATCH 5/7] spi: s3c64xx: Add Exynos850 support

[Tudor Ambarus]

On 1/20/24 01:29, Sam Protsenko wrote:
> Add SPI port configuration for Exynos850 SoC. It has 3 USI blocks which
> can be configured in SPI mode:
> 
>   * spi_0: BLK_PERI_SPI_0 (0x13940000)
>   * spi_1: BLK_ALIVE_USI_CMGP00 (0x11d00000)
>   * spi_2: BLK_ALIVE_USI_CMGP01 (0x11d20000)
> 
> SPI FIFO depth is 64 bytes for all those SPI blocks, so the
> .fifo_lvl_mask value is set to 0x7f. All blocks have DIV_4 as the
> default internal clock divider, and an internal loopback mode to run
> a loopback test.
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>

Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>

> ---
>  drivers/spi/spi-s3c64xx.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
> index 0e48ffd499b9..f7d623ad6ac3 100644
> --- a/drivers/spi/spi-s3c64xx.c
> +++ b/drivers/spi/spi-s3c64xx.c
> @@ -1461,6 +1461,17 @@ static const struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
>  	.quirks		= S3C64XX_SPI_QUIRK_CS_AUTO,
>  };
>  
> +static const struct s3c64xx_spi_port_config exynos850_spi_port_config = {
> +	.fifo_lvl_mask	= { 0x7f, 0x7f, 0x7f },

I'll come with a follow up patch on top of this. Having the dt alias
used as an index in the fifo_lvl_mask to determine the FIFO depth is
wrong. Not only because of the dependency on the alias, but also because
the fifo_lvl_mask value does not reflect the FIFO level reg field.
Playing with what we have now is ok by me, I find the patch good.

> +	.rx_lvl_offset	= 15,
> +	.tx_st_done	= 25,
> +	.clk_div	= 4,
> +	.high_speed	= true,
> +	.clk_from_cmu	= true,
> +	.has_loopback	= true,
> +	.quirks		= S3C64XX_SPI_QUIRK_CS_AUTO,
> +};
> +
>  static const struct s3c64xx_spi_port_config exynosautov9_spi_port_config = {
>  	.fifo_lvl_mask	= { 0x1ff, 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff, 0x7f,
>  			    0x7f, 0x7f, 0x7f, 0x7f},
> @@ -1515,6 +1526,9 @@ static const struct of_device_id s3c64xx_spi_dt_match[] = {
>  	{ .compatible = "samsung,exynos5433-spi",
>  			.data = (void *)&exynos5433_spi_port_config,
>  	},
> +	{ .compatible = "samsung,exynos850-spi",
> +			.data = (void *)&exynos850_spi_port_config,
> +	},
>  	{ .compatible = "samsung,exynosautov9-spi",
>  			.data = (void *)&exynosautov9_spi_port_config,
>  	},

Re: [PATCH 5/7] spi: s3c64xx: Add Exynos850 support

[Sam Protsenko]

On Wed, Jan 24, 2024 at 12:49 AM Tudor Ambarus <tudor.ambarus@linaro.org> wrote:
>
>
>
> On 1/20/24 01:29, Sam Protsenko wrote:
> > Add SPI port configuration for Exynos850 SoC. It has 3 USI blocks which
> > can be configured in SPI mode:
> >
> >   * spi_0: BLK_PERI_SPI_0 (0x13940000)
> >   * spi_1: BLK_ALIVE_USI_CMGP00 (0x11d00000)
> >   * spi_2: BLK_ALIVE_USI_CMGP01 (0x11d20000)
> >
> > SPI FIFO depth is 64 bytes for all those SPI blocks, so the
> > .fifo_lvl_mask value is set to 0x7f. All blocks have DIV_4 as the
> > default internal clock divider, and an internal loopback mode to run
> > a loopback test.
> >
> > Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
>
> Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
>
> > ---
> >  drivers/spi/spi-s3c64xx.c | 14 ++++++++++++++
> >  1 file changed, 14 insertions(+)
> >
> > diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
> > index 0e48ffd499b9..f7d623ad6ac3 100644
> > --- a/drivers/spi/spi-s3c64xx.c
> > +++ b/drivers/spi/spi-s3c64xx.c
> > @@ -1461,6 +1461,17 @@ static const struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
> >       .quirks         = S3C64XX_SPI_QUIRK_CS_AUTO,
> >  };
> >
> > +static const struct s3c64xx_spi_port_config exynos850_spi_port_config = {
> > +     .fifo_lvl_mask  = { 0x7f, 0x7f, 0x7f },
>
> I'll come with a follow up patch on top of this. Having the dt alias
> used as an index in the fifo_lvl_mask to determine the FIFO depth is
> wrong. Not only because of the dependency on the alias, but also because
> the fifo_lvl_mask value does not reflect the FIFO level reg field.
> Playing with what we have now is ok by me, I find the patch good.
>

Yeah, we just have to make sure all our patches are taken in the
correct order, to avoid any possible conflicts.

> > +     .rx_lvl_offset  = 15,
> > +     .tx_st_done     = 25,
> > +     .clk_div        = 4,
> > +     .high_speed     = true,
> > +     .clk_from_cmu   = true,
> > +     .has_loopback   = true,
> > +     .quirks         = S3C64XX_SPI_QUIRK_CS_AUTO,
> > +};
> > +
> >  static const struct s3c64xx_spi_port_config exynosautov9_spi_port_config = {
> >       .fifo_lvl_mask  = { 0x1ff, 0x1ff, 0x7f, 0x7f, 0x7f, 0x7f, 0x1ff, 0x7f,
> >                           0x7f, 0x7f, 0x7f, 0x7f},
> > @@ -1515,6 +1526,9 @@ static const struct of_device_id s3c64xx_spi_dt_match[] = {
> >       { .compatible = "samsung,exynos5433-spi",
> >                       .data = (void *)&exynos5433_spi_port_config,
> >       },
> > +     { .compatible = "samsung,exynos850-spi",
> > +                     .data = (void *)&exynos850_spi_port_config,
> > +     },
> >       { .compatible = "samsung,exynosautov9-spi",
> >                       .data = (void *)&exynosautov9_spi_port_config,
> >       },

Re: (subset) [PATCH 0/7] arm64: exynos: Enable SPI for Exynos850

[Mark Brown]

On Fri, 19 Jan 2024 19:29:41 -0600, Sam Protsenko wrote:
> This series enables SPI for Exynos850 SoC. The summary:
> 
>   1. Enable PDMA, it's needed for SPI (dts, clk)
>   2. Propagate SPI src clock rate change up to DIV clocks, to make it
>      possible to change SPI frequency (clk driver)
>   3. Add Exynos850 support in SPI driver
>   4. Add SPI nodes to Exynos850 SoC dtsi
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[2/7] dt-bindings: spi: samsung: Add Exynos850 SPI
      commit: 737cf74b38007fd5d5d2f15d4d4bc16e5f1cbfed
[5/7] spi: s3c64xx: Add Exynos850 support
      commit: 0229278bf33ea69cc1bba12c287f173e9b18c1f8

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark